X-Git-Url: https://review.fuel-infra.org/gitweb?a=blobdiff_plain;f=cirros-testvm%2Fsrc-cirros%2Fbuildroot-2015.05%2Fpackage%2Fhostapd%2F0003-EAP-pwd-fixes.patch;fp=cirros-testvm%2Fsrc-cirros%2Fbuildroot-2015.05%2Fpackage%2Fhostapd%2F0003-EAP-pwd-fixes.patch;h=16a1f539883327300329b88ebb51801525e49147;hb=b0a0f15dfaa205161a7fcb20cf1b8cd4948c2ef3;hp=0000000000000000000000000000000000000000;hpb=c6ac3cd55ee2da956195eee393b0882105dfad4e;p=packages%2Ftrusty%2Fcirros-testvm.git

diff --git a/cirros-testvm/src-cirros/buildroot-2015.05/package/hostapd/0003-EAP-pwd-fixes.patch b/cirros-testvm/src-cirros/buildroot-2015.05/package/hostapd/0003-EAP-pwd-fixes.patch
new file mode 100644
index 0000000..16a1f53
--- /dev/null
+++ b/cirros-testvm/src-cirros/buildroot-2015.05/package/hostapd/0003-EAP-pwd-fixes.patch
@@ -0,0 +1,154 @@
+This patch combines the following upstream security fixes:
+
+28a069a545b0 EAP-pwd peer: Fix asymmetric fragmentation behavior
+3035cc2894e0 EAP-pwd server: Fix Total-Length parsing for fragment reassembly
+477c74395acd EAP-pwd peer: Fix Total-Length parsing for fragment reassembly
+e28a58be2618 EAP-pwd server: Fix payload length validation for Commit and Confirm
+dd2f043c9c43 EAP-pwd peer: Fix payload length validation for Commit and Confirm
+
+Details at 
+http://w1.fi/security/2015-4/eap-pwd-missing-payload-length-validation.txt
+
+Signed-off-by: Baruch Siach <baruch@tkos.co.il>
+---
+diff --git a/src/eap_peer/eap_pwd.c b/src/eap_peer/eap_pwd.c
+index f2b092669a42..e58b13a42f73 100644
+--- a/src/eap_peer/eap_pwd.c
++++ b/src/eap_peer/eap_pwd.c
+@@ -355,6 +355,23 @@ eap_pwd_perform_commit_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
+ 	BIGNUM *mask = NULL, *x = NULL, *y = NULL, *cofactor = NULL;
+ 	u16 offset;
+ 	u8 *ptr, *scalar = NULL, *element = NULL;
++	size_t prime_len, order_len;
++
++	if (data->state != PWD_Commit_Req) {
++		ret->ignore = TRUE;
++		goto fin;
++	}
++
++	prime_len = BN_num_bytes(data->grp->prime);
++	order_len = BN_num_bytes(data->grp->order);
++
++	if (payload_len != 2 * prime_len + order_len) {
++		wpa_printf(MSG_INFO,
++			   "EAP-pwd: Unexpected Commit payload length %u (expected %u)",
++			   (unsigned int) payload_len,
++			   (unsigned int) (2 * prime_len + order_len));
++		goto fin;
++	}
+ 
+ 	if (((data->private_value = BN_new()) == NULL) ||
+ 	    ((data->my_element = EC_POINT_new(data->grp->group)) == NULL) ||
+@@ -554,6 +571,18 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
+ 	u8 conf[SHA256_MAC_LEN], *cruft = NULL, *ptr;
+ 	int offset;
+ 
++	if (data->state != PWD_Confirm_Req) {
++		ret->ignore = TRUE;
++		goto fin;
++	}
++
++	if (payload_len != SHA256_MAC_LEN) {
++		wpa_printf(MSG_INFO,
++			   "EAP-pwd: Unexpected Confirm payload length %u (expected %u)",
++			   (unsigned int) payload_len, SHA256_MAC_LEN);
++		goto fin;
++	}
++
+ 	/*
+ 	 * first build up the ciphersuite which is group | random_function |
+ 	 *	prf
+@@ -837,11 +866,23 @@ eap_pwd_process(struct eap_sm *sm, void *priv, struct eap_method_ret *ret,
+ 	 * if it's the first fragment there'll be a length field
+ 	 */
+ 	if (EAP_PWD_GET_LENGTH_BIT(lm_exch)) {
++		if (len < 2) {
++			wpa_printf(MSG_DEBUG,
++				   "EAP-pwd: Frame too short to contain Total-Length field");
++			ret->ignore = TRUE;
++			return NULL;
++		}
+ 		tot_len = WPA_GET_BE16(pos);
+ 		wpa_printf(MSG_DEBUG, "EAP-pwd: Incoming fragments whose "
+ 			   "total length = %d", tot_len);
+ 		if (tot_len > 15000)
+ 			return NULL;
++		if (data->inbuf) {
++			wpa_printf(MSG_DEBUG,
++				   "EAP-pwd: Unexpected new fragment start when previous fragment is still in use");
++			ret->ignore = TRUE;
++			return NULL;
++		}
+ 		data->inbuf = wpabuf_alloc(tot_len);
+ 		if (data->inbuf == NULL) {
+ 			wpa_printf(MSG_INFO, "Out of memory to buffer "
+@@ -927,6 +968,7 @@ eap_pwd_process(struct eap_sm *sm, void *priv, struct eap_method_ret *ret,
+ 	/*
+ 	 * we have output! Do we need to fragment it?
+ 	 */
++	lm_exch = EAP_PWD_GET_EXCHANGE(lm_exch);
+ 	len = wpabuf_len(data->outbuf);
+ 	if ((len + EAP_PWD_HDR_SIZE) > data->mtu) {
+ 		resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PWD, data->mtu,
+diff --git a/src/eap_server/eap_server_pwd.c b/src/eap_server/eap_server_pwd.c
+index 66bd5d2e9179..2bfc3c27647d 100644
+--- a/src/eap_server/eap_server_pwd.c
++++ b/src/eap_server/eap_server_pwd.c
+@@ -656,9 +656,21 @@ eap_pwd_process_commit_resp(struct eap_sm *sm, struct eap_pwd_data *data,
+ 	BIGNUM *x = NULL, *y = NULL, *cofactor = NULL;
+ 	EC_POINT *K = NULL, *point = NULL;
+ 	int res = 0;
++	size_t prime_len, order_len;
+ 
+ 	wpa_printf(MSG_DEBUG, "EAP-pwd: Received commit response");
+ 
++	prime_len = BN_num_bytes(data->grp->prime);
++	order_len = BN_num_bytes(data->grp->order);
++
++	if (payload_len != 2 * prime_len + order_len) {
++		wpa_printf(MSG_INFO,
++			   "EAP-pwd: Unexpected Commit payload length %u (expected %u)",
++			   (unsigned int) payload_len,
++			   (unsigned int) (2 * prime_len + order_len));
++		goto fin;
++	}
++
+ 	if (((data->peer_scalar = BN_new()) == NULL) ||
+ 	    ((data->k = BN_new()) == NULL) ||
+ 	    ((cofactor = BN_new()) == NULL) ||
+@@ -774,6 +786,13 @@ eap_pwd_process_confirm_resp(struct eap_sm *sm, struct eap_pwd_data *data,
+ 	u8 conf[SHA256_MAC_LEN], *cruft = NULL, *ptr;
+ 	int offset;
+ 
++	if (payload_len != SHA256_MAC_LEN) {
++		wpa_printf(MSG_INFO,
++			   "EAP-pwd: Unexpected Confirm payload length %u (expected %u)",
++			   (unsigned int) payload_len, SHA256_MAC_LEN);
++		goto fin;
++	}
++
+ 	/* build up the ciphersuite: group | random_function | prf */
+ 	grp = htons(data->group_num);
+ 	ptr = (u8 *) &cs;
+@@ -923,11 +942,21 @@ static void eap_pwd_process(struct eap_sm *sm, void *priv,
+ 	 * the first fragment has a total length
+ 	 */
+ 	if (EAP_PWD_GET_LENGTH_BIT(lm_exch)) {
++		if (len < 2) {
++			wpa_printf(MSG_DEBUG,
++				   "EAP-pwd: Frame too short to contain Total-Length field");
++			return;
++		}
+ 		tot_len = WPA_GET_BE16(pos);
+ 		wpa_printf(MSG_DEBUG, "EAP-pwd: Incoming fragments, total "
+ 			   "length = %d", tot_len);
+ 		if (tot_len > 15000)
+ 			return;
++		if (data->inbuf) {
++			wpa_printf(MSG_DEBUG,
++				   "EAP-pwd: Unexpected new fragment start when previous fragment is still in use");
++			return;
++		}
+ 		data->inbuf = wpabuf_alloc(tot_len);
+ 		if (data->inbuf == NULL) {
+ 			wpa_printf(MSG_INFO, "EAP-pwd: Out of memory to "